Door stop



FIG. 1 is an exploded perspective view of a door stop showing my new design in use;

FIG. 2 is an assembled side elevation thereof;

FIG. 3 is a top view thereof; and,

FIG. 4 is a bottom view thereof.

The floor, wall and door shown in broken lines in FIG. 1 denote the nature and environmental use of the design and are not part of the claimed design. 

CLAIM The ornamental design for a door stop, as shown and described. 